For small starters, just institute background and mental health status checks of buyers.
Close the "gun show" loophole.
Eliminate the availability of large capacity magazines.
Make after market alterations of weapons, to enable true "rapid fire" and automatic capability, illegal.
Then allow citizens to buy weapons, and stare at them to their heart's content.
And perhaps an IQ test later on, but Congress would never allow that, local constituency would freak out.
And let's not hash up that tired old bullshit about "bad guys with guns" !!
"Bad guys" will always get guns...my God (yours too?)...the U.S has gazillions of them.
Almost all the "bad guys" lately have gotten their weapons by otherwise "legal" means anyway.
Sensible gun regulation requires sensible citizens.